detector status pisa activities analysis laboratory tests

Trieste 20 settembre 2006 Commissione I

•Detector status•Pisa activities

•Analysis•Laboratory tests

TileCal Status report (ATLAS-Pisa)


TileCal InstallationBarrel at interaction point

EBC

EBA

• Barrel: finished December 2004

• Extended Barrel C: finished February 2006

• Extended Barrel A: finished May 2006

The three TileCal cylinders are fully installed in the ATLAS cavern


EBA installation

23 March: First 18 modules lowered

20 April: LAr cryostat lowered

24 May: EBA finished (Done in 8.5 weeks!)


Gap, crack, MBT scintillators

• Installation status: gap, cryostat, and minimum bias trigger scintillators completely installed on both extended barrels

• Fiber cabling and light sealing finished, currently being tested

Minimum bias trigger scintillators (8)

Cryostat (crack) scintillators (64)

Gap scintillators (64)


Cesium system status

• Interconnection/piping of cesium tubes done for 3 cylinders • Local equipment (garages, electronics boxes) installed for 3

cylinders • September: install hydraulic system in UX15 racks• October: connect to the drive, wet test using dummy source • November: start calibrations in barrel using 137Cs source

UX15 level 0


Status of drawers• Barrel: insertion and

certification finished– Waiting for access to repair

1 drawer

• Extended barrel: – Insertion finished– Recertification ongoing

after transport to pit and cylinder assembly

– So far 31/128 drawers tested

– Waiting for access to repair faults found


LVPS: Introduction• Finger low voltage power supply

(fLVPS)– Fits in finger– 8 voltage outputs from 8 bricks– Bricks controlled by PCB in box

called ELMB_MB• Problems found after first attempts

at commissioning with LVPS– Safety: damage to drawers caused

by overvoltage– Noise: higher noise in integrator

and digital readouts associated with power supplies

– DCS: LVPS control improving • These problems have been studied

and solutions have been found• Dealing with these problems has

severely impacted deployment and commissioning


LVPS: Schedule

• Boxes currently being installed are assembled with bricks and ELMB_MB modified for safety by hand– ~50% already installed in barrel (not final version)– 4 with final ELMB_MB ready for commissioning (1

week)• Final version of LVPS (guarantee

performance/stability) under test


ROD System• Status of production:

– ROD Production COMPLETED: All 32 RODs needed (8 per partition) already produced.

– 24 RODs + related boards (75% of the total) installed in USA15 for LBA, LBC and EBC.

• Firmware upgraded to avoid busy signals in case of front-end failures.

ROD commissioning in progress: already used for combined cosmic runs

Combined

Tile+RPC+

MDT run

August 14,

2006

E. Feng, S. Rosati,

S. Veneziano

and many more in the

Tile and Muon groups

Combined

Tile+LAr run

3 weeks ago

R. Teuscher and

many more in the

Tile and LAr groups


Pisa responsibilities

We are well represented in all these activities.

Iacopo Vivarelli tile performance (test commiss.)

Chiara Roda co-convener of JetEtMiss group

Andrea Dotti online monitoring (presenter)

Nino Del Prete TileCal IB chair


Activities at CERN (2006/2007)in which we are directly involved

• trigger cabling LB (Sept-Dec) (techs)• Test all LB (LVPS, HV tests, FE) (Jan-Dec 2007)

(Iacopo, Francesca, Maria)• Barrel timing with laser (Sept./dec) (Iacopo, Paolo)• DAQ/Monitor (Sept./Aug.). (Chiara, Andrea,Danilo)• Cosmics Run (standalone, with MDT/RPC Lar) fall 2006-2007 (all)• Installation/commisioning EBC, EBA (The same amount

of work as for LB) (know how from LB)• Make it work! (2006/2007) (all)


Other activities in Pisa

Physics studies: VBF Higgs : Hbar

Top quark physics

Jet calibration

Comparison G4/CTB

Low energy pions in CTB

Laboratory measurements: (PMT/Fibres response stability)


A.Dotti


Very Low Energy CTB

CTB has collected data at low energy (3-9 Gev/c)

• It is important to measure the calorimeters response to a low energy pion (a jet = many low energy pions)

• It is difficult for many experimental problems:

• particle identification (e, pion, mu)

• the beam has a parasitic high energy muon component

• energy calibration is still not properly understood

The work is still in progress.

(M. Canneri, V. Cavasinni, F. Sarri, I. Vivarelli)


CTB set up for VLE

Our aim: obtain the purest pion sample from VLE data.The VLE beam is made of electrons, pions and muons

(μ at the same η of the run and off axis).Electrons are easy to separate.

ALL sub-detector are exploited for the muon selection

Muon tag BC-2

Sec. targetDipole magnets CHRV2, LE

VLE particles

HE muons

BC-1 BC1 BC2

Beam stopBC0

Quadrupole magnets

ID

Muon wall

LAr Tile

Cryostat scint.

Muon Halo

S1 S2/3

MDT/RPC


LE Muon identification in TileCal (likelihood)

)()()( 332211 EPEPEPL (Pi(E) energy distr. in Tile layer i)

MC DATA

PionsPions

The shape of L allows a rejection of muons.MC do not quite reproduce data


Event selection – off axis muon ID with timining

• We want to identify off-axis muons with an unbiased calorimeter selection we cannot use the position of the energy deposits

• Hypothesis: the presence of the off-axis muon is uncorrelated with the trigger. Consequence: the timing of the off-axis muon should be randomly distributed in the acquisition window.

• That is the case. Powerfull way to reject the off-axis muons

• An event is rejected if both the channels of 1 cell have the reconstructed time outside a 35 ns large window.

On-axis event

Off-axis event

Tile channel 18

η = 0.35

φ = 0

Tile channel 14

η = 0.15

φ = 0

ns

ns


Francesca Sarri, Giulio Usai

PMTs STABILITYPMTs STABILITY

We have measured in our lab the gain, QE, noise etc of 24 PMT (the same used in TileCal), illuminated with continuous light simulating LHC at L=1034 cm-2s-

1.

Led light yield monitored by two photodiodes.

Surprisingly the gain of all PMT increased with time at a rate of about 0.5-0.7 % per month.

No instrumental effect was found. Moreover the precise Cs calibration in different CTB periods confirms the effect also quantitatively.

In 2007 we will follow up this effect.


Backup slides


Composizione del gruppo ATLAS-Pisa

V.Cavasinni PO 0.8D. CiminoBors 0.8T. Del Prete INFN 1.A. Dotti Dott 1.V. Flaminio PO 0.2A. Lupi AR 1.C. Roda RU 0.8F. Sarri Dott 1.I. Vivarelli AR 1.

Totale 7.6 FTE


Richieste 2007

MI: metabolismo: 1 kE*FTE = 7.6 kE Riunioni Tier2 (2 sett), Monitor (3 sett) Workshops (ATLAS/CMS ed ATLAS) (8 sett) = 13 Sett TOTALE 7.6 kE+...

ME: metabolismo: 1.5 mu*FTE = 11.4 mu 4 coordinamenti = 4 mu A. Dotti, Monitor e DAQ per TileCal, I. Vivarelli, Online-Daq e commissioning (WP4) C. Roda, co-cordinatriced del gruppo JetEtMiss N. Del Prete, Chair dell’ Institute Board di TileCal commissioning: tecnici (7 mu) (cablatura, riparazioni...) fisici (16 mu): due fisici devono essere permanenti al CERN durante il 2007 per la messa a punto dell’apparato. TOTALE 38 mu


hET miss

HVBF(120 GeV) hh

fbhhBRHBRVBFsig 125)()( BR (tau hadrons) : 65% ; BR(hh) : 42.25

%

VBF H = 300 fb

Signal signature :- 2 high pt forward jets , - 2 central tau jet ,- ET

miss

4 jets & ETmiss

Backgrounds: QCD (~9 mb), Z/*+jets (1700 pb) , ttbar (550 pb)Crucial the tau identification: collaboration with Milano, Freiburg, Toronto

V.Cavasinni, F.Sarri, I. Vivarelli


Cut Signalefficienc

yEvents

QCDefficienc

yEvents

Z+jetsefficienc

yEvents

Ttbarefficienc

yEvents

4jet (2 tau), Et

miss > 45 GeV

4.4% 3.4 10-8 4.6 10-3 7.3 10-4

Pt tau (45,35)

1.14% 2.3 10-11 5.8 10-4 1.1 10-4

Pt forward (60,40)

0.72% 7.4 10-12 2.2 10-4 6.8 10-5

forward 0.37% 4.7 10-13 1.3 10-5 2.4 10-6

Cuts 0.25% 7.5 10-14 5.8 10-6 0.5 10-6

Mjj (700 GeV) 0.22% 5.8 10-14 5.0 10-6 4 10-7

Jet veto (30 GeV)

0.2% 7.3

3.2 10-14 9

3.2 10-6

671.7 10-7

4.4

Mass window 0.15%

61.7 10-15

0.55 1.6 10-7

3.3 0

SUMMARY ATLFAST 30 fb-1

In p

rogr

ess

Validation with full simulation started


COMPARISON ON ECOMPARISON ON ETTMISSMISS AND NUMBER OF AND NUMBER OF

JETSJETS

red : full AODs, black fast AODs.

QCD

SIGNAL


Jet calibration

The H1 method : jet energy is the sum of weighted cell energy.

QCD 2 jets events has been used to compute weights using “topoclusters” and cone algorithm (R=0.7).

The method/weights prooved to be good also for calibrating jets with different cones (R=0.4) and different samples (t-tbar) and seems to work well also for CTB data.

This algorithm is robust and stable and is implemented in ATHENA.


Similar good results using the same weghts obtained witha Cone0.4, ttbar events, and CTB data


Monitor and Presenter

•Presentations on the progress of the monitoring working group presented at CHEP06 by A.Dotti and W.Vandelli.


RPC

We use the RPC in order to try to understand the fake by MDT on electronevents (many events have more than 13 hits in MDT).They could be muons that are outside Tile calorimeter acceptance.

RPC


RPC geometry

Zone of inefficiency for muons by Tile

Only the bottom halfof the RPC (negative y)is working in the runs


Energy ε for μ off axis ε for μ by likelihood μ-contamination e-contamination

(GeV) (%) (%) |likelihood|<30 (%) [μ (1-εmu lik)] /π (%) /π 9 92.4 ± 0.6 89.7 ± 1.0 15.0 0.6

7 85.8 ± 0.8 99.3 ± 0.1 2.7 0

5 94.0 ± 0.7 99.48 ± 0.07 10.2 0.3

3 83.6 ± 2.2 99.83 ± 0.03 11.1 0.6

Efficiencies and contamination

Electrons are easily identified by beam Cerenkov.Muons can be identified using L or by MDT etc.

In p

rogr

ess


A CTB “TAU jet”

• 3 pion of 7 GeV superimposed in LaR TILE


Test beam data, Energy deposit: G4 vs EXP, muons (1), the em scale

(V.Kazanine)

MOP value EXP: 3340±60 MC : 3399±6

Energy deposition in the calorimeters (log and lin scales)

Lar+Tile Lar+Tile


Energy deposit: G4 vs EXP, pions (1)

• All cells in TileCal are used while in LAr only the cells within ±0.2 eta and ±0.2 phi LAr window (eta = 0.25, phi = 0) are used;• The cut on the energy at cells is Ecell > 2 sigma noise;• Energy deposition in the calorimeter is the sum over selected cells;• The energy deposition at Cryo is approximated as :

1 . 47 ETileA E BackLArTotal energy deposit. The correction on energy deposition at Cryo is included.

Lar+Tile


Pions : sADC_Cherenkov2<620 && N hits in TRT <4 && not μ(mouns: signal in MDT or MuonWall or MuonTag)E Tile in the cone 0.19< η <0.61, all φ; E Lar in the cone 0.19 < η <0.61, -0.1< φ < 0.1

Energy Distributions for pions

Pions at 9 GeV


red : full AODs, black fast AODs.

In progress:-Validate ATLFAST with full simulation-New parametrization for tau-ID (with the Toronto Group)

QCD SIGNAL


Same weights applied also to the ttbar events, Rome sample


The same weights (determined in QCD MC events) work well for different cone definitions, for different samples and also

(preliminary) on Combined Test Beam data. This method seems more robust than the “standard” ATLAS jet calibration


First steps on CTB comparison: G4 vs EXP

Vassili Kazanine (Budker Institute Novosibirsk, a former (and future) FAI in Pisa)

The simulation of calorimeters in G4 has been the subject of previous studies (Anna, Andrea) using TileCal standalone (TB vs G4).Now G4 simulation of CTB is available and Vassili has taken up the issue of comparing data and MC.

The energy scale seems to be under control and the total energy deposition in Tile+Lar is well reproduced, but: • the energy in Lar is predicted too large and in tile too small• once more we have the problem of the longitudinal shower shape not correctly predicted by G4.


Almost 14 months(April05-May06)

Vnom:= Gain(Vnom) = 105

Gain(V) ~ V

Light source changed, because of LED and LED driver broken at the end of Jan’06.

Status up to 2006

Labo:

Vn/Vn = -.41±0.13 (3mnts estimate) (measured untill Jan’06)

Cs Calibration (at theCTB):

Vn/Vn = -.36±0.04 (3mnts)


Summary: NOV’05-JAN’06

Average slope of 15 PMTs, NomVol drop estimate in 3 months

Average slope of 15 PMTs, PMT/PHD rise estimate in 3 months.

mean : - 0.36 % rms : 0.22 %

mean : 1.6 % rms : 0.8 %

NomVol drop (%) PMT/PhD (%)


The curved fibre ageing

50 cm

N. Del Prete, Francesca Sarri


Fibre ageing

Step motor

Shutter

PMT

At each step, the PMT current is measured.Then the wheel is positioned in the different locations for more precise measurements.

The precision in the ratio Fibra1/Fibra2 is about 6 10-4 sistematics under study


Richieste: ME

Stato delle spese ad oggi:

ME: assegnato 109 k€ speso ad oggi 55K€ (51%)manca ancora il contributo tecnici per commissioning (7 mu)

E’ richiesta la presenza continua al CERN di Vivarelli e Dotti. Questo non e’ compatibile col finanziamento attuale.

Abbiamo richiesto una integrazione di 6 mu per arrivare a fine anno.


DAQ A new, friendly, DAQ system was built using a CAEN Brigde (V1792) which interface VME to a PC where the DAQ system runs through ROOT.

A student (Marco Raglianti) from the Computer Science Department has designed this nice and simple system as part of his “tesi di tirocinio”.

The Bridge has become a powerful development system. C++ programs can be fully tested, in ROOT, and then compiled and run on single board PC in VME.

What is missing are VME units (ADC etc.): we use old CAMAC units that we have interfaced to VME. Often these units are faulty...


Preliminary.The precision of the method is OK. The problem is

the mechanical stability (LED position, optical couplings etc.).

Time (h)

10-3

rms = 6 10-4

detector status pisa activities analysis laboratory tests

Documents

gap scintillators

drawerextended barrel

extended barrel c

cryostat crack scintillators

maria barrel timing

lar cryostat lowered24

final elmb

tilecal cylinders